30 rainbow trout found dead near Dworshak Dam in Idaho

The Army Corps of Engineers is investigating whether the startup of the turbines at the Dworshak Dam is responsible for the deaths of around 30 rainbow trout, according to an Army Corps press release.

The US Army Corps of Engineers found the dead fish in late December after the Idaho Fish and Game reported sightings of numerous dead rainbow trout on the North Fork of the Clearwater River, which joins the Snake River. near the Idaho-Washington border.

After a preliminary investigation, according to the Army Corps, operators followed all turbine start-up procedures, including the use of compressed air to help lower the water level under the turbine blades.

The purpose of these procedures is to dramatically reduce fish mortality. However, there are always risks involved in fishing, according to the Army Corps.

In 2016, around 200 rainbow trout were found dead at Dworshak Dam. At the time, the Army Corps said an non-routine upgrade to one of the turbines appeared to have injured the fish.

The corps did not respond to questions about the incident on time.

Steelhead’s deaths come after record low yields rainbow trout in the Columbia River last summer, according to an OPB report.

Rainbow trout are large trout that migrate to the ocean and return to freshwater to spawn. If the fish do not migrate to the ocean, they are called rainbow trout. Rainbow trout on the Columbia and Snake rivers are listed as threatened on the federal endangered species list.

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